Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1985-07-16
1986-04-29
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 17, 331 25, H03L 706
Patent
active
045860050
ABSTRACT:
An analog phase interpolator for use in Fractional-N frequency synthesis is disclosed. The interpolator employs a precision gating circuit adapted to generate analog signals indicative of a precisely determined time interval. The signals switch a precision correction current to precisely compensate for the phase detector "beat note" to reduce the magnitude of FM spurious signals. The time interval is inversely proportional to the synthesizer output frequency and the gating circuit automatically compensates for changes in the output frequency. The precision gating circuit includes a prescaler circuit for prescaling the output signal frequency to provide a clock signal, and is responsive to an "initiate" pulse to provide two pulses delayed by a predetermined number of clock signal periods. A very high degree of time integrity exists in the relation of the edges of the two pulses. The same edges of the pulse are used to derive a gating signal which gates the correction current into an integrating capacitor for the time interval defined between these corresponding edges, to minimize errors resulting from different propagation delays and slew rates.
REFERENCES:
patent: 4184068 (1980-01-01), Washburn
patent: 4525685 (1985-06-01), Hesselberth et al.
patent: 4536718 (1985-08-01), Underhill
Hughes Aircraft Company
Karambelas Anthony W.
LaRoche Eugene R.
Mis D. C.
Runk Thomas A.
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